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Vulnerability record · CVE-2020-15106 · published 5 August 2020

CVE-2020-15106: Etcd improper input validation vulnerability

Etcd · Etcd

In etcd before versions 3.3.23 and 3.4.10, a large slice causes panic in decodeRecord method. The size of a record is stored in the length field of a WAL file and no additional validation is done on this data. Therefore, it is possible to forge an extremely large frame size that can unintentionally panic at the expense of any RAFT participant trying to decode the WAL.

6.5 CVSS 3.1 Medium EPSS 1.3% · top 30.9% CWE-20 · Improper input validation
6.5CVSS 3.1 base score, v2 4.0
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

In etcd before versions 3.3.23 and 3.4.10, a large slice causes panic in decodeRecord method. The size of a record is stored in the length field of a WAL file and no additional validation is done on this data. Therefore, it is possible to forge an extremely large frame size that can unintentionally panic at the expense of any RAFT participant trying to decode the WAL.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/etcd-io/etcd/security/advisories/GHSA-p4g4-wgrh-qrg2 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE
https://github.com/etcd-io/etcd/security/advisories/GHSA-p4g4-wgrh-qrg2 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE

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Source: NIST National Vulnerability Database (record CVE-2020-15106), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.